Impaired olfactory discrimination learning and decreased olfactory sensitivity in aged C57Bl/6 mice

• Published in: Neurobiology of aging Vol. 30; no. 5; pp. 829 - 837
• Main Authors: Patel, Roseanne C, Larson, John
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.05.2009
• Subjects: Aging - physiology; Animals; Brain - physiopathology; Cues; Discrimination Learning - physiology; Disease Models, Animal; Internal Medicine; Learning; Learning Disorders - physiopathology; Memory; Memory Disorders - physiopathology; Mice; Mice, Inbred C57BL; Mouse; Neurology; Neuropsychological Tests; Odor discrimination; Olfaction; Olfaction Disorders - physiopathology; Olfactory learning; Olfactory Pathways - physiopathology; Smell - physiology; Learning; Odor discrimination; Olfactory learning; Mouse; Memory; Olfaction
• ISSN: 0197-4580; 1558-1497
• DOI: 10.1016/j.neurobiolaging.2007.08.007

Abstract Young (4 months) and old (24 months) C57Bl/6J mice were tested in an automated simultaneous-cue, two-odor discrimination task. The mice were first pre-trained to execute trial-structured nose poke responses in a straight alley. They were then trained to criterion on a series of eight novel olfactory discrimination problems. Old mice required slightly more shaping sessions to acquire the nose poke response. The old mice required many more sessions and made 70% more errors than young mice before reaching criterion performance on the series of eight olfactory discrimination problems. Young and old mice did not differ in retention of the last odor discrimination when tested 2 weeks after training. Old mice had significantly higher thresholds for discriminating ethyl acetate vapor from non-odorized air. The results suggest that mice may be a good model for study of olfactory dysfunction and cognitive deficits with aging.